A dioptra (sometimes also named dioptre or diopter, from Greek: διόπτρα) is a classical astronomical and surveying instrument, dating from the 3rd century...

observed in Alexandria and Rome used as a hypothetical example in Hero's Dioptra, and found that it best matched the details of an eclipse in 62 AD; A....

Instruments used in surveying include: Alidade Alidade table Cosmolabe Dioptra Dumpy level Engineer's chain Geodimeter Graphometer Groma (surveying) Laser...

and angles were measured using a sighting rod that the Greeks called a dioptra, the forerunner of the Arabic alidade. A detailed contemporary collection...

is often attributed to Hipparchus. A combination of the planisphere and dioptra, the astrolabe was effectively an analog computer capable of working out...

designed. In old texts, the speculum may also be referred to as a diopter or dioptra. Like an endoscope, a speculum allows a view inside the body; endoscopes...

photography A theodolite or similar surveyor's angle measuring device A dioptra, an old surveying device An alidade A surgical speculum An instrument for...

Dioptra Island (Bulgarian: остров Диоптра, romanized: ostrov Dioptra, IPA: [ˈɔstrov diˈɔptrɐ]) is the conspicuous 290 m long in east-west direction and...

year. Anathem Armillary sphere De architectura Epicycle Lemniscate On the Dioptra The word is rare in English, not to be found in most dictionaries. The...

the direct light from a star Cosmolabe – Ancient astronomical instrument Dioptra – Classical surveying instrument from the 3rd century BCE Equatorial ring –...